feat(worker): remove a queued interactive message

StreamingClaudeSession.RemoveQueuedAsync drops the first occurrence of a queued
message from _pending and re-broadcasts the updated queue. Wired through
InteractiveSessionService + WorkerHub.RemoveQueuedInteractiveMessage +
IWorkerClient.RemoveQueuedInteractiveMessageAsync. Removal by text (first match)
is robust to a turn flushing mid-click. Fakes + ILiveSession impls updated.

src/ClaudeDo.Worker/Hub/WorkerHub.cs

@@ -584,6 +584,9 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
     public Task InterruptInteractiveSession(string taskId) =>
         _interactive.InterruptAsync(taskId, Context.ConnectionAborted);
 
+    public Task RemoveQueuedInteractiveMessage(string taskId, string text) =>
+        _interactive.RemoveQueuedAsync(taskId, text, Context.ConnectionAborted);
+
     public async Task<DiscardPlanningOutcome> DiscardPlanningSessionAsync(string taskId, bool dequeueQueuedChildren = false)
     {
         var outcome = await _planning.DiscardAsync(taskId, dequeueQueuedChildren, Context.ConnectionAborted);